Environmental and Biotic Factors Impacting the Activities of Bdellovibrio bacteriovorus

Im, Hansol; Bäcker, Leonard E.; Mitchell, Robert J.

doi:10.1007/978-3-030-45599-6_6

Cited by 4 publications

(4 citation statements)

References 86 publications

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“…Additionally, these explorations suggest a potential configuration-dependent overestimation or underestimation of bacterial predation by simple force-dipole models that may be of pertinence to more sophisticated computational and theoretical evaluations of predatory bacteria that include relevant physiological factors, such as the possible chemotaxis of predatory species, steric interactions between predator and prey, or the presence of multiple predator or prey bacteria. With multiple recent works having suggested and evaluated predatory bacteria for use in industry [47][48][49], we envisage that the refined hydrodynamic model presented in this work will enable higher fidelity theoretical investigation into the cell-level dynamics of these applications, in addition to forming the basis of models exploring the effects of environment heterogeneity and the impacts of viscosity on predation [32,[50][51][52].…”

Section: Discussionmentioning

confidence: 99%

Regularized representation of bacterial hydrodynamics

2020

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Fluid flows induced by a flagellated bacterial swimmer are often modeled as a simple force dipole, valid in the far field. Such representations neglect the inherent rotation of these bacteria as they swim, driven by a spinning helical flagellum or fascicle. Here, we present a refined swimmer representation that makes use of regularized singularities, retaining simplicity while capturing details of the complex flow field near the swimmer that have previously been absent from basic models. We illustrate the significance of this representation via a study of bacterial predator-prey dynamics, highlighting the importance of detailed hydrodynamics in models of bacterial interactions and bacterial active matter.

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Section: Discussionmentioning

confidence: 99%

Regularized representation of bacterial hydrodynamics

2020

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“…Heterogeneity in many abiotic factors such as temperature, prey nutrition, pH, oxygen availability, salinity, and surface or fluid viscosity is known or likely to influence microbial predator-prey interactions [21][22][23][24][25][26], and microbial antagonisms more broadly [27][28][29][30]. For example, predators and prey may be differentially sensitive to pH gradients [25,31] and temperature influences many bacterial traits relevant to predation, including cell division rates and motility behavior [32,33].…”

Section: Introductionmentioning

confidence: 99%

Killer prey: Ecology reverses bacterial predation

Vasse,

Fiegna,

Kriesel

et al. 2024

PLoS Biol

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Ecological variation influences the character of many biotic interactions, but examples of predator–prey reversal mediated by abiotic context are few. We show that the temperature at which prey grow before interacting with a bacterial predator can determine the very direction of predation, reversing predator and prey identities. While Pseudomonas fluorescens reared at 32°C was extensively killed by the generalist predator Myxococcus xanthus, P. fluorescens reared at 22°C became the predator, slaughtering M. xanthus to extinction and growing on its remains. Beyond M. xanthus, diffusible molecules in P. fluorescens supernatant also killed 2 other phylogenetically distant species among several examined. Our results suggest that the sign of lethal microbial antagonisms may often change across abiotic gradients in natural microbial communities, with important ecological and evolutionary implications. They also suggest that a larger proportion of microbial warfare results in predation—the killing and consumption of organisms—than is generally recognized.

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“…Heterogeneity in many abiotic factors such as temperature, prey nutrition, pH, oxygen availability, salinity, and surface or fluid viscosity is known or likely to influence microbial predatorprey interactions (21)(22)(23)(24)(25)(26), and microbial antagonisms more broadly (27)(28)(29)(30). For example, predators and prey may be differentially sensitive to pH gradients (25,31) and temperature influences many bacterial traits relevant to predation, including cell-division rates and motility behavior (32,33).…”

Section: Introductionmentioning

confidence: 99%

Killer prey: Temperature reverses future bacterial predation

Vasse¹,

Fiegna²,

Kriesel³

et al. 2023

Preprint

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Ecological variation influences the character of many biotic interactions, but examples of predator-prey reversal mediated by abiotic context are few. We show that the temperature at which prey grow before interacting with a predatory bacterial species can determine the very direction of predation, reversing the identities of predator and prey. When lawns of Pseudomonas fluorescens were reared at 32 °C before release of the generalist predator Myxococcus xanthus, M. xanthus extensively killed P. fluorescens. However, when M. xanthus was released onto lawns of P. fluorescens reared at 22 °C, P. fluorescens was the predator, slaughtering M. xanthus to extinction and growing on its remains. Cooler-reared P. fluorescens killed M. xanthus by secreting diffusible molecules that, while lethal to M. xanthus, were benign toward most of several other diverse bacterial species examined. Our results suggest that the sign of predator-prey interactions – and lethal microbial antagonisms more broadly – may often change across abiotic gradients in natural microbial communities, with important ecological and evolutionary implications. They also suggest that a larger proportion of microbial warfare results in predation – the killing and consumption of organisms – than is generally recognized.

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Environmental and Biotic Factors Impacting the Activities of Bdellovibrio bacteriovorus

Cited by 4 publications

References 86 publications

Regularized representation of bacterial hydrodynamics

Regularized representation of bacterial hydrodynamics

Killer prey: Ecology reverses bacterial predation

Killer prey: Temperature reverses future bacterial predation

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